GridControl & RMAN repository Schemas on one DB

Is this good practice, what would be pros & cons? What are the best practices?

My personal preference is to have them separate since:
- The requirements are different and your OMR upgrade/patching is also going to affect your catalog which you may not want (already mentioned)
- Your catalog, and OMR should be small separate instances from everything else, as each is the admin for their respective duties, i.e. (backup/recovery) and monitoring, and your catalog should contain backup/recovery data for everything including your OMR.
If you are running a RAC and/or Data Guard and don't have a problem with your OMR patching affecting your catalog, or vice versa them here I don't see issues in combing the two.
Now taking into consideration you are in a small shop, and assuming:
- You probably don't have a lot of instances so you are not doing backups throughout much of the day (so you can plan your OEM outages around when you are not doing backups
- You will be doing exp/imp for the catalog and/or using the control file as the catalog for this instance
- You may have license concerns
I would use a single instance for both schemas.
Hope this helps in your decision and good luck.
On another note, I think that we each have our own experiences from which our opinions are formed. It is not that all the time anyone is right or wrong, just that their experiences are different.

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